So sorry. Yes, I neglected to mention what these are from. These should all be from 1970-1974 Barracudas, and the quantity shown does not necessarily reflect the quantity used per car. These are a collection from likely several cars.

The U-shaped clip is metal.

The rusty nut is one of those somewhat funny shaped ones. At one time I was thinking it was for the radiator shroud. Not sure.

Thanks.